Dragonfly JFet boost explanation?

[jhabib]

http://www.aronnelson.com/gallery/main.php/v/Daves-Layouts/Dragonfly+JFet+Boost.gif.html

Newbie here, could someone walk me through each part

[sevenisthenumber]

Great boost. Very simple! Hopefully someone will explain it!

[mac]

think input like two 2m2 resistors in parallel and a small 22k in series, almost like one 1m and a 22k.
my bet is that the first one is the anti pop resistor. i guess that pop goes to gnd through the first resistor and not through the gate resistor.
the rest is standard.

mac

[earthtonesaudio]

Starting at the input, you have a 22k series resistor and a 2.2M shunt to ground.  This first 2.2M resistor looks like it should be an anti-pop resistor, but there is no input capacitor shown, so it's not necessary.  Anyway, the 22k then goes to the gate of the JFET where there is another 2.2M resistor to ground.  The 22k and 2.2M form a voltage divider which very slightly attenuates the input at all frequencies, and the 22k in conjunction with the Miller capacitance of the JFET (invisible but-still-there capacitance between drain and gate) forms a low-pass filter for very high frequencies (i.e. keeps it from picking up so much radio noise).  The 2.2M to ground provides bias for the JFET because JFETs can "self bias" like this.  You can sometimes bias PNP transistors this way too.
From there it's a pretty standard class A transistor amplifier.  The 2.2k resistor raises the source up above ground which allows the "self bias" technique to work.  This resistor also develops a signal voltage across it, forming a kind of negative feedback (limiting gain).  The 10u C2 capacitor bypasses this resistor for AC signals so there is very little (practically no) AC negative feedback at this node.
On the other end of the JFET, the drain resistor (22k) limits the overall current through the JFET and allows a signal to be developed at the drain.  C1 AC-couples this signal to the output volume potentiometer.
The output potentiometer also provides a path to ground for any leakage coming through C1, thus forming an output anti-pop pull-down resistor.